What size should the main size of water supply be for operations to avoid needing a second hydrant?

The appropriate size for the main water supply in operations is crucial for ensuring adequate flow and pressure to support firefighting efforts. A main size of less than 12 inches is considered optimal because it can typically provide sufficient water flow without necessitating the use of a second hydrant. This size strikes a balance between being large enough to deliver the required water supply for effective firefighting, while still being manageable within the existing infrastructure of urban water systems.

Larger mains can certainly handle more volume, but anything exceeding this size may not be required for most operations, potentially leading to inefficiencies or complications without substantial benefits. Additionally, understanding the hydraulics involved, such as friction loss and flow rates, is critical in fireground operations; thus, sticking to a supply main of this size tends to simplify logistics on scene. The selected size allows firefighters to maintain effective operations and quickly assess their water supply capabilities during an emergency situation.